"The Generation and Propagation of Sound" Sound Phenomenon PPT Courseware 4

Description

"The Generation and Propagation of Sound" Sound Phenomenon PPT Courseware 4

learning target:

1. Through observation and experiment, initially understand the conditions for sound generation and propagation.

2. Know that sound is produced by the vibration of objects.

3. Know that sound propagation requires a medium, and sound propagates at different speeds in different media.

1. The occurrence of sound

Please do the experiment together:

1. Shake the pages of the book with your hands to make sounds

2. Make a sound of "Ah——" and touch your throat with your hands at the same time

Let me ask you: What did you see when you heard the sound? What did you feel again?

We can find that the object that makes the sound is vibrating

Apply what you learn:

Fill in the horizontal lines with appropriate objects

Human speech is produced by ________ vibration;

The sound of firecrackers is produced by ________ vibration;

The sound of running water is caused by ________ vibration;

The sound of the piano is produced by ________ vibration.

2. Propagation of sound

Self-study guidance: Read "Inquiry" on page 14 of the textbook and think (2 minutes)

1. How does sound spread from the object that makes the sound to a distant place?

2. For sound to spread, what is needed as a medium?

Sound can be transmitted through all gas, liquid, and solid materials as media. These materials as transmission media are often referred to as media for short. Sound travels through media.

3. The propagation speed of sound

Self-study guidance: Read the "Speed ​​of Sound" content on page 15 of the textbook and think about the following questions (5 minutes)

1. What information did you see?

2. What do numbers such as “331” represent?

3. How are the sound speeds in the table sorted?

4. What are the differences in the speed of sound in solids, liquids, and gases?

5. What are the factors that affect the speed of sound?

Small scale chopper:

1. Question 5 of "Learning Physics Using Your Hands and Brain" on page 16 of the textbook.

2. Railway workers can know in advance the coming trains in the distance by putting their ears close to the rails. Why?

3. Question 4 of "Learning Physics Using Your Hands and Brain" on page 16 of the textbook.

In-person testing

1. Sound is produced by the __________ of objects. The propagation of sound requires __________. Sound cannot propagate in a vacuum. Sound can propagate not only in the air, but also in liquids and solids, but the propagation speed is different. When At the same temperature, the speed of propagation is greatest in __________.

2. Tap one end of a long iron pipe filled with water. You will hear __________ sounds at the other end of the iron pipe. The first sound is from __________ and the last sound is from _ _________passed over.

3. There is such a narrative in "Mengxi Bi Tan": During the night march, the soldiers slept on the ground with their cowhide quivers as pillows, and could hear the sound of the enemy's horse hooves early in the night. This is because________________

4. The physical knowledge reflected in the poem "Hanshan Temple outside Gusu City, the midnight bell rings to the passenger ship" in the Tang Dynasty poem "Night Mooring at Maple Bridge" is ________. (write two points)

5. In order to explore the conditions for sound generation, some people suggest using the following experimental phenomena:

A: The alarm clock placed in the bell jar is ringing. If some air is removed from the bell jar, the ringing sound will be significantly reduced.

B: Make the sounding tuning fork touch the water surface, and the water surface will splash.

C: When playing the flute, pressing different holes with your fingers will produce different sounds.

Ding: Fix a small pen on the hanging bell. After ringing the bell, quickly drag the paper across the tip of the pen to draw a thin line that curves back and forth on the paper.

Which experimental phenomenon or phenomena do you think can explain the conditions for sound generation? Although the other conditions cannot explain the conditions for sound generation, what problems do they explain?

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Update Time: 2024-10-19

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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